text: int strcmp(char *s1, char *s2) {
      while (*s1 != '\0' && *s1 == *s2) {
          s1++;
          s2++;
      }
      return (*(unsigned char *)s1) - (*(unsigned char *)s2);
  }
  
  void strcpy(char *dest, char *src) {
      while (*src != '\0') {
          *dest = *src;
          src++;
          dest++;
      }
      *dest = *src;
  }